Additional info:
reporter:       libreport-2.1.11
WARNING: CPU: 2 PID: 1043 at drivers/gpu/drm/i915/intel_uncore.c:124 gen6_gt_check_fifodbg.isra.6+0x38/0x50 [i915]()
MMIO read or write has been dropped 3
Modules linked in: rfcomm btusb fuse veth vhost_net vhost macvtap macvlan usb_storage xt_CHECKSUM tun ip6t_ipv6header nf_conntrack_tftp nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE bnep bluetooth ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw e1000e snd_hda_codec_hdmi snd_hda_codec_conexant snd_hda_intel snd_hda_codec snd_hwdep arc4 iwldvm mac80211 x86_pkg_temp_thermal coretemp kvm_intel kvm iTCO_wdt uvcvideo videobuf2_vmalloc iwlwifi snd_seq cfg80211 videobuf2_memops sdhci_pci videobuf2_core sdhci videodev mmc_core media snd_seq_device snd_pcm iTCO_vendor_support mei_me lpc_ich ptp shpchp pps_core microcode mei i2c_i801 mfd_core serio_raw thinkpad_acpi snd_page_alloc snd_timer joydev snd wmi tpm_tis binfmt_misc soundcore rfkill tpm tpm_bios nfsd auth_rpcgss nfs_acl lockd sunrpc dm_crypt crct10dif_pclmul i915 crc32_pclmul crc32c_intel ghash_clmulni_intel i2c_algo_bit firewire_ohci drm_kms_helper firewire_core crc_itu_t drm video i2c_core
CPU: 2 PID: 1043 Comm: X Not tainted 3.12.6-300.fc20.x86_64 #1
Hardware name: LENOVO 42406EG/42406EG, BIOS 8AET56WW (1.36 ) 12/06/2011
 0000000000000009 ffff8800c90c7a70 ffffffff816630c1 ffff8800c90c7ab8
 ffff8800c90c7aa8 ffffffff810691dd ffff88020f5cc020 ffff88020f5cc028
 0000000000000206 ffff88020f5a0800 0000000000000206 ffff8800c90c7b08
Call Trace:
 [<ffffffff816630c1>] dump_stack+0x45/0x56
 [<ffffffff810691dd>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8106924c>] warn_slowpath_fmt+0x4c/0x50
 [<ffffffffa0128f9b>] ? i915_read32+0x6b/0x140 [i915]
 [<ffffffffa0128458>] gen6_gt_check_fifodbg.isra.6+0x38/0x50 [i915]
 [<ffffffffa0128498>] __gen6_gt_force_wake_put+0x28/0x30 [i915]
 [<ffffffffa0128c93>] gen6_gt_force_wake_put+0x33/0x50 [i915]
 [<ffffffffa011f67a>] gen6_ring_put_irq+0x8a/0xc0 [i915]
 [<ffffffffa00d46c3>] __wait_seqno+0x3a3/0x550 [i915]
 [<ffffffff8108be90>] ? wake_up_atomic_t+0x30/0x30
 [<ffffffffa00d5100>] i915_wait_seqno+0x70/0xa0 [i915]
 [<ffffffffa00d52fa>] i915_gem_object_wait_rendering+0x4a/0x80 [i915]
 [<ffffffffa00d7aaf>] i915_gem_object_set_to_gtt_domain+0x4f/0x1c0 [i915]
 [<ffffffffa00db4de>] i915_gem_pwrite_ioctl+0x80e/0x990 [i915]
 [<ffffffff81077853>] ? __sigqueue_free.part.15+0x33/0x40
 [<ffffffff81077f9b>] ? recalc_sigpending+0x1b/0x50
 [<ffffffff81078072>] ? dequeue_signal+0x32/0x160
 [<ffffffffa0020c32>] drm_ioctl+0x502/0x630 [drm]
 [<ffffffff8107b01c>] ? signal_setup_done+0x3c/0x60
 [<ffffffff81012575>] ? do_signal+0x195/0x5e0
 [<ffffffff8101cde7>] ? __restore_xstate_sig+0x87/0x500
 [<ffffffff811c0cdd>] do_vfs_ioctl+0x2dd/0x4b0
 [<ffffffff811c0f31>] SyS_ioctl+0x81/0xa0
 [<ffffffff81672129>] system_call_fastpath+0x16/0x1b